發(fā)布時(shí)間：2018-05-19 21:29

  本文選題：實(shí)時(shí)移動(dòng)視頻 + 碼率控制�。� 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：隨著近幾年科技的飛速發(fā)展，移動(dòng)設(shè)備快速普及，移動(dòng)傳輸技術(shù)大力推進(jìn)，我們進(jìn)入了移動(dòng)互聯(lián)網(wǎng)時(shí)代。在移動(dòng)互聯(lián)網(wǎng)應(yīng)用中，移動(dòng)視頻是不可或缺的一大部分，人們通過(guò)移動(dòng)設(shè)備，可以隨時(shí)隨地進(jìn)行視頻會(huì)議、觀看視頻監(jiān)控、視頻點(diǎn)播以及電視直播，移動(dòng)視頻極大地豐富了人們的生活。但由于移動(dòng)網(wǎng)絡(luò)傳輸不穩(wěn)定以及帶寬受限，視頻數(shù)據(jù)在移動(dòng)網(wǎng)絡(luò)中傳輸時(shí)容易發(fā)生數(shù)據(jù)丟包、傳輸時(shí)延增大，導(dǎo)致移動(dòng)視頻畫(huà)面質(zhì)量下降、播放延時(shí)以及不流暢。 本課題針對(duì)移動(dòng)視頻所遇到的問(wèn)題，對(duì)移動(dòng)視頻QoS相關(guān)技術(shù)進(jìn)行了研究。對(duì)于移動(dòng)網(wǎng)絡(luò)中帶寬受限、帶寬大小易發(fā)生變化導(dǎo)致網(wǎng)絡(luò)發(fā)生擁塞，使得視頻播放不流暢的情況，本文提出了一種基于多編碼器共用的碼率控制技術(shù)，該技術(shù)在服務(wù)端編碼模塊中采用基于多編碼器共用的質(zhì)量切換機(jī)制，使用戶在變換視頻碼率時(shí)視頻不發(fā)生停頓，并且服務(wù)端可支持大用戶量并發(fā)訪問(wèn)，，通過(guò)客戶端統(tǒng)計(jì)數(shù)據(jù)包的傳輸時(shí)延與丟包率，對(duì)網(wǎng)絡(luò)狀況進(jìn)行估算并向服務(wù)端進(jìn)行反饋控制，服務(wù)端根據(jù)反饋指令切換用戶的視頻碼率。 對(duì)于移動(dòng)網(wǎng)絡(luò)傳輸時(shí)數(shù)據(jù)發(fā)生丟包，導(dǎo)致視頻解碼受到影響，造成視頻質(zhì)量下降的情況，文中提出基于網(wǎng)絡(luò)狀況的丟包恢復(fù)策略，該策略結(jié)合了基于RS編碼的前向糾錯(cuò)恢復(fù)技術(shù)以及限時(shí)丟包重傳技術(shù)，針對(duì)不同的網(wǎng)絡(luò)狀況采用合理的丟包恢復(fù)技術(shù)。 本文提出了網(wǎng)絡(luò)自適應(yīng)移動(dòng)視頻QoS技術(shù)，該技術(shù)結(jié)合了基于多編碼器共用的碼率控制技術(shù)，使視頻碼率與網(wǎng)絡(luò)帶寬相匹配，避免網(wǎng)絡(luò)擁塞，保證視頻的實(shí)時(shí)性與流暢性；結(jié)合基于網(wǎng)絡(luò)狀況的丟包恢復(fù)策略，降低丟包對(duì)視頻的影響，保證視頻的質(zhì)量；根據(jù)H.264碼流與UDP傳輸?shù)奶攸c(diǎn)，制定了分封包處理策略。 本文最后對(duì)網(wǎng)絡(luò)自適應(yīng)移動(dòng)視頻QoS技術(shù)進(jìn)行了實(shí)驗(yàn)與分析，并運(yùn)用在實(shí)時(shí)移動(dòng)視頻監(jiān)控系統(tǒng)中。實(shí)驗(yàn)結(jié)果表明，通過(guò)采用網(wǎng)絡(luò)自適應(yīng)移動(dòng)視頻QoS技術(shù)，可以解決網(wǎng)絡(luò)擁塞以及數(shù)據(jù)丟包所帶來(lái)的問(wèn)題，客戶端通過(guò)移動(dòng)網(wǎng)絡(luò)觀看視頻時(shí)，視頻的實(shí)時(shí)性、流暢性與質(zhì)量得到了保證，QoS技術(shù)取得了良好的效果。
[Abstract]:With the rapid development of science and technology, the rapid popularization of mobile devices, mobile transmission technology vigorously promote, we have entered the era of mobile Internet. In mobile Internet applications, mobile video is an indispensable part. Through mobile devices, people can conduct video conferences, watch video surveillance, video on demand and live television at any time and anywhere. Mobile video has greatly enriched people's lives. However, due to the instability of mobile network transmission and bandwidth constraints, video data in the mobile network is prone to packet loss, transmission delay increases, resulting in the degradation of mobile video picture quality, playback delay and not smooth. In order to solve the problem of mobile video, the QoS technology of mobile video is studied in this paper. In this paper, a rate control technique based on multiple encoders is proposed for the mobile network where the bandwidth is limited and the bandwidth is easy to change, which leads to the congestion of the network and makes the video playback not smooth. In the server coding module, a quality switching mechanism based on multi-encoder sharing is adopted, which makes the video not pause when the user changes the video bit rate, and the server can support the concurrent access of the large number of users. The transmission delay and packet loss rate of the data packet are counted by the client, and the network condition is estimated and feedback control is carried out to the server. The server switches the video code rate of the user according to the feedback instruction. In this paper, a packet loss recovery strategy based on network condition is proposed, which results in the loss of packet in mobile network transmission, which results in the video decoding being affected and the video quality declining. The strategy combines forward error correction recovery technology based on RS coding and time-limited packet loss retransmission technology, and adopts reasonable packet loss recovery technology for different network conditions. In this paper, the network adaptive mobile video QoS technology is proposed, which combines the rate control technology based on multiple encoders, which makes the video rate match with the network bandwidth, avoids network congestion, and ensures the real-time and fluency of the video. According to the characteristics of H.264 bitstream and UDP transmission, a packet processing strategy is proposed to reduce the impact of packet loss on video and ensure the quality of video. At the end of this paper, the network adaptive mobile video QoS technology is tested and analyzed, and it is used in the real time mobile video surveillance system. The experimental results show that the network adaptive mobile video QoS technology can solve the problems caused by network congestion and data packet loss, and the real-time performance of the video can be achieved when the client watches the video through the mobile network. Fluency and quality have been guaranteed by QoS technology and good results have been achieved.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN948.6;TP393.09

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